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<h1>navo/algorithm/hash/signature/ipcs.h</h1>  </div>
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<a href="ipcs_8h.html">浏览该文件的文档。</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */</span>
<a name="l00011"></a>00011 <span class="preprocessor">#ifdef _MSC_VER</span>
<a name="l00012"></a>00012 <span class="preprocessor"></span><span class="preprocessor">#pragma once</span>
<a name="l00013"></a>00013 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* #ifdef _MSC_VER */</span>
<a name="l00014"></a>00014 
<a name="l00015"></a>00015 <span class="preprocessor">#ifndef __NV_IPCS__</span>
<a name="l00016"></a>00016 <span class="preprocessor"></span><span class="preprocessor">#define __NV_IPCS__</span>
<a name="l00017"></a>00017 <span class="preprocessor"></span>
<a name="l00018"></a>00018 <span class="preprocessor">#include &quot;<a class="code" href="cdef_8h.html" title="Definitions and declarations for common constants, types, variables.">../../../port/cdef.h</a>&quot;</span>
<a name="l00019"></a>00019 <span class="preprocessor">#include &quot;<a class="code" href="integer_8h.html" title="Provides standard integer types.">../../../port/integer.h</a>&quot;</span>
<a name="l00020"></a>00020 <span class="preprocessor">#include &quot;<a class="code" href="endian_8h.html" title="Definitions for byte order.">../../../port/endian.h</a>&quot;</span>
<a name="l00021"></a>00021 
<a name="l00022"></a>00022 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> {
<a name="l00024"></a>00024 <span class="preprocessor">#endif  </span><span class="comment">/* #ifdef __cplusplus */</span>
<a name="l00025"></a>00025 
<a name="l00036"></a><a class="code" href="structipcs__ctx.html">00036</a> <span class="keyword">typedef</span> <span class="keyword">struct </span>{
<a name="l00038"></a><a class="code" href="structipcs__ctx.html#a607f39712288bbe0d8f28904df4a92bd">00038</a>     uint32_t <a class="code" href="structipcs__ctx.html#a607f39712288bbe0d8f28904df4a92bd">sum</a>;
<a name="l00039"></a>00039 }<a class="code" href="structipcs__ctx.html" title="TCP/IP checksum上下文">ipcs_ctx</a>;
<a name="l00040"></a>00040 
<a name="l00041"></a>00041 <span class="preprocessor">#define IPCS_SIZE 2</span>
<a name="l00042"></a>00042 <span class="preprocessor"></span>
<a name="l00047"></a><a class="code" href="group__TCP.html#gadde5f9c82aad7ddac91562170ecc5637">00047</a> <span class="preprocessor">#define IPCS_CTX(name) ipcs_ctx name = {0}</span>
<a name="l00048"></a>00048 <span class="preprocessor"></span>
<a name="l00055"></a><a class="code" href="group__TCP.html#ga13c9b4e370138cefac42666a3a7fae2e">00055</a> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="group__TCP.html#ga13c9b4e370138cefac42666a3a7fae2e" title="初始化TCP/IP checksum上下文">ipcs_init</a>(<a class="code" href="structipcs__ctx.html" title="TCP/IP checksum上下文">ipcs_ctx</a>* ctx)
<a name="l00056"></a>00056 {
<a name="l00057"></a>00057     ctx-&gt;<a class="code" href="structipcs__ctx.html#a607f39712288bbe0d8f28904df4a92bd">sum</a> = 0;
<a name="l00058"></a>00058 }
<a name="l00059"></a>00059 
<a name="l00060"></a>00060 NV_API uint32_t __ipcs_update(uint32_t sum, uint16_t* buf, <span class="keywordtype">size_t</span> words);
<a name="l00061"></a>00061 
<a name="l00070"></a><a class="code" href="group__TCP.html#ga158afb15757fb1784ce80d5461d084f4">00070</a> <span class="keyword">static</span> <span class="keyword">inline</span> <a class="code" href="group__TCP.html#ga158afb15757fb1784ce80d5461d084f4" title="计算TCP/IP校验码">ipcs_update</a>(<a class="code" href="structipcs__ctx.html" title="TCP/IP checksum上下文">ipcs_ctx</a>* ctx, <span class="keywordtype">void</span>* buf, <span class="keywordtype">size_t</span> cnt)
<a name="l00071"></a>00071 {
<a name="l00072"></a>00072     ctx-&gt;<a class="code" href="structipcs__ctx.html#a607f39712288bbe0d8f28904df4a92bd">sum</a> = __ipcs_update(ctx-&gt;<a class="code" href="structipcs__ctx.html#a607f39712288bbe0d8f28904df4a92bd">sum</a>, (uint16_t*)buf, cnt &gt;&gt; 1);
<a name="l00073"></a>00073 }
<a name="l00074"></a>00074 
<a name="l00075"></a>00075 <span class="keyword">static</span> <span class="keyword">inline</span> uint32_t __ipcs_final(<a class="code" href="structipcs__ctx.html" title="TCP/IP checksum上下文">ipcs_ctx</a>* ctx, uint32_t sum)
<a name="l00076"></a>00076 {
<a name="l00077"></a>00077     ctx-&gt;<a class="code" href="structipcs__ctx.html#a607f39712288bbe0d8f28904df4a92bd">sum</a> = 0;
<a name="l00078"></a>00078     
<a name="l00079"></a>00079     sum = (sum &gt;&gt; 16) + (sum &amp; 0xFFFF);
<a name="l00080"></a>00080     sum += (sum &gt;&gt; 16);
<a name="l00081"></a>00081     
<a name="l00082"></a>00082     <span class="keywordflow">return</span> ~sum;
<a name="l00083"></a>00083 }
<a name="l00084"></a>00084 
<a name="l00092"></a><a class="code" href="group__TCP.html#ga2124d67e632138360ba6680b1ab56df1">00092</a> <span class="keyword">static</span> <span class="keyword">inline</span> uint16_t <a class="code" href="group__TCP.html#ga2124d67e632138360ba6680b1ab56df1" title="获取CRC校验值">ipcs_final</a>(<a class="code" href="structipcs__ctx.html" title="TCP/IP checksum上下文">ipcs_ctx</a>* ctx)
<a name="l00093"></a>00093 {
<a name="l00094"></a>00094     <span class="keywordflow">return</span> (uint16_t)__ipcs_final(ctx, ctx-&gt;<a class="code" href="structipcs__ctx.html#a607f39712288bbe0d8f28904df4a92bd">sum</a>);
<a name="l00095"></a>00095 }
<a name="l00096"></a>00096 
<a name="l00099"></a>00099 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00100"></a>00100 <span class="preprocessor"></span>}
<a name="l00101"></a>00101 <span class="preprocessor">#endif  </span><span class="comment">/* #ifdef __cplusplus */</span>
<a name="l00102"></a>00102 
<a name="l00103"></a>00103 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef __NV_IPCS__ */</span>
<a name="l00104"></a>00104 
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